You must have seen these. A “tag your friend” post, to win something. You like the post (to help make it visible), you like the page (that’s the aim), and you tag a friend (to increase reach). A random winner is picked up from amongst the comments at the end.
Sound simple, right? You’d be surprised.
Head over to Felix the Fox’s site for a good infographic about the effectiveness of such promotions: The effectiveness of Facebook giveaways – FELIX THE FOX MYSTERIES